A-LevelPhysicsIdeal gases9702/12 · May/June 2012 · Q211 Mark
In an experiment to demonstrate Brownian motion, a transparent container is filled with smoke particles suspended in air. What can be seen when the contents of the container are strongly illuminated and viewed through a microscope?
Aair molecules that are colliding with smoke particles
Bair molecules that are moving in straight lines
Csmoke particles that are moving in random zigzag paths
Dsmoke particles that are moving in straight lines
✓ Correct answer
C: smoke particles that are moving in random zigzag paths
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